<div class="zoom">
  <span class="zoom-button" [ngClass]="{'disabled': disabledIn }" (click)="onZoomIn()"><i class="anticon anticon-plus"></i></span>
  <span class="zoom-button" [ngClass]="{'disabled': disabledOut }" (click)="onZoomOut()"><i class="anticon anticon-minus"></i></span>
</div>